[ih] Hourglass model question

[John Day]

Actually, the first appearance of the margarita glass is an Annex to TC97/SC16/N227, October 1978. The second meeting of OSI, the first meeting of the Working Groups. It was drawn by John Aschenbrenner of IBM and one of the originators of SNA.

The 1979 document you cite was Aschenbrenner’s report to the ANSI group after the 2nd SC16 Plenary in London in mid-1979. Since the October 1978 meetings were Working Groups only, Aschenbrenner would only report after an SC meeting.

John

> On Jul 3, 2019, at 09:54, Andrew Russell <arussell at arussell.org> wrote:
> 
> Hi everyone - 
> 
> You might have seen the CACM featured an article in the most recent issue “On the Hourglass Model” - https://cacm.acm.org/magazines/2019/7/237714-on-the-hourglass-model/fulltext <https://cacm.acm.org/magazines/2019/7/237714-on-the-hourglass-model/fulltext>. 
> 
> It’s not a history paper, but it raised a history-related question for me.  As far as I know the visual representation in question started with a drawing of a margarita glass in 1979, in the context of an OSI committee meeting and the 7-layer model. I reproduced the image on page 214 of my book “Open Standards and the Digital Age” - it’s visible to me here: 
> https://books.google.com/books?id=jqroAgAAQBAJ&pg=PA214&lpg=PA214 <https://books.google.com/books?id=jqroAgAAQBAJ&pg=PA214&lpg=PA214>.
> 
> My question for the list has 2 parts:
> 1) when/where did the margarita glass turn into an hourglass?
> 2) when/where did the TCP/IP community borrow it from the OSI community?  (I’m assuming this is how it happened, would be very interested in evidence or recollections to the contrary)
> 
> My hunch, without doing a fresh round of research, is that I should look first to papers by David Clark and co-authors in the 1980s to answer a third question, which is how this illustrated concept morphed into a “Theorem” (as the CACM essay puts it).  But that’s just a hunch, and I’d really appreciate pointers or recollections.
> 
> Thank you!
> 
> Andy
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